Automatic phonograph-stop



C. H. LENERVILLE.

AUTOMATIC PHONOGRAPH STOP.

APPLICATION FILED JAN. 3. 1 920- 1,349,970. Patented Aug- 17, 1929.

CLIFFORD H. LENERVILLE, 0F PESH'IIGO, WISCONSIN.

AUTOMATIC PHONOG RAPH-STOP. I

Specification of Letters Patent.

Patented Aug. 17, 1920.

Application filed January 3,1920. Serial No. 349,271.

To all whom it may concern:

Be it known that I, CLIFFORD H. LENER- VILLE, a citizen of the United States, and resident of Peshtigo, in the county of Marinette and State of \Visconsin, have invented certain new and useful Improvements in Automatic Phonograph-Stops; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates tonew and useful improvements in attachments for phonographs, and has particularly reference to automatic stops for discontinuing the rotation of the phonograph turntable at a predetermined time.

The primary object of this invention is to provide an. automatic phonograph stop which may be very inexpensively manufac tured and installed, yet one which will be extremely eflicient and positive in operation. This is primarily accomplished by constructing the stop of a comparatively small number of parts, each of which is of simple design, and assembling these parts in such manner that much use and long wear will have no effect on the positiveness of the operation.

\Vith this general object in view the invention consists in the novel features of construction, combination and arrangement of the parts which will be hereinafter more particularly described and claimed.

In the accompanying drawing:

. Figure 1 represents a plan view of an automatic phonograph stop constructed in accordance with the invention, the major operating parts thereof being located beneath a phonograph turntable which is broken away to more clearly illustrate the same and F 2 is a detail sectional view through the trip arm.

Referring more particularly to this drawing, it will be noticed that the reference character T denotes a phonograph turntable adapted for the usual purpose of sup porting and rotating the phonograph records, and beneath which is located the automatic stop mechanism. The movement of the tone arm (not shown) is indicated by the dot and dash lines at the top of Fig. 1, and this tone arm is adapted to carry a trip pin P.

The stop mechanism includes an attachmg plate 1 designed to be secured by screws or the like 2 to the phonograph beneath the mounted on the turntable T, and fulcrumed on this plate by means of a pivot 3 is a brake bar 4;. This brake bar 4;, pivoted intermediate its ends, pr rides at one end a latch bar engaging stud 5, and at its other end a resetting arm 6,. while the intermediate portion of the bar has a brake shoe 7 secured thereto. This brake shoe is designed to engage the depending wall 1V of the turntable T on its inner surface, and thus the only exposed part-of the brake bar is the resetting arm 6.

Also tulcrumcd on the attaching plate 1 bymeans oil a pivot pin 8 is a bell crank shaped latch bar 9 one arm 10 of which extends somewhatradially of the turntable T and intersects the longitudinal center line of the brake bar 4-, whereby the stud 5 of the latter will be in a position to engage with a notch 11 of said arm 10.

The other arm 12 of the latch bar which extends substantially at right angles to the arm 10 has a trip arm 13 pivoted thereto by means of a bolt 14. Referring to Fig. 2 it will be seen that the trip arm 13 is loosely bolt 14 while the latter is tl'ireadedly engaged with the opening in the arm 12 of the latch bar, and that a spring 15 surrounding the bolt 14 holds the trip arm in frictional engagement with the other arm 12. By this arrangement the trip arm may be adjusted at various angles with respect to the arm 12 and will be retained in this position by the tension of said spring 15, thus permitting the stop to be used in connection with different sizes of phonograph records.

In order that the arm 10 of the bell. crank shaped latch bar may be urged toward the stud 5, a contractile spring 16 has one end connected to said arm 10 and the other end to the brake bar 4 to the outer side of the pivot pin 3. A similar contractile spring 17 of a considerably throw the brake shoe against the turntable wall TV when the trip 13 is actuated, one end of this spring being connected with the attaching plate 1 and the other end with the brake bar 4 between the pivot pin 3 thereof and the stud 5.

Each of the parts of the device 1, 4, 9 and 13, may be readily stamped from light gage sheet metal or the like and at very little expense. Therefore in view of the lightness of the parts a very eflicient structure is provided by making the pivot pins 3 and 8 in the form of rivets, or in other words non-adstronger tension is used to just-able, so that when once assembled the stud 5 will always be retained in position to engage within said notch 11.

' The invention is operated in a manner substantially similar to usual phonograph stops, the trip arm 13 being first adjusted with respect to the arm 12 to permit the playing of a desired size of record, after which the resetting arm 6 is shifted to release the brake shoe from the turntable and simultaneously engage the stud 5 in the notch 11. The parts of the stop are thus set and held against the tension of the springs 16 and 17 until the tone arm pin P contacts with the trip arm 13. This contact will rock the latch bar 9 on its pivot pin 8 and move the arm 10 away from the'brake bar with a con sequent disengagement of the stud 5 from the notch 11.

Various minor changes-may be made in the-form and proportion and in the general arrangement of the-several parts of the device without departing from or sacrificing any of the features of the invention.

I claim: V

An automatic stop comprising an attaching plate, 'a brake bar pivoted intermediate its ends to the plate, one end forming a latch bar engaging member, the other end comprising a resetting arm, a bellcrank shaped latch bar pivoted to the plate and having means carried by one arm for cooperation with said latch bar engagingmemher, a spring fixed to said arm of the latch bar and to the brake bar between the pivot thereof and said resetting arm, a second spring of greater tension than the first hav- 7 ing one end attached to the brake bar between the pivot thereof and said latch bar engaging member, and thereunder being fixed, and a trip arm on one arm of the latch bar. 7

'In testimony that I claim the foregoing I have hereunto set my'hand at Peshtigo, in the county of Marinette and State of /Visconsin.

CLIFFORD H. 'LENERVILLE. 

